Compressor



sept. 4, 1923. www@ l w. PRELLWITZ COMPBES SOR Filed Feb. 7, 1922 2 sheets-sheet l AT ORNEY Sep@ 4, w23.

W. PRELLWITZ coMPREssoR File@ Feb. v

2 Sheets-Sheet 2 as ATTRNEY ?atented Sept. d, i923.

haalde@ narran raras earner carica,

WILLIAM PRELLWITZ, 0F EASTON, ENNSYLVANI, ASSGNGE 'I O INGEBSOLL-RAND COMPANY, 0F JERSEY CITY, NEW JERSEY, A CGBPDRATION OF NEW JMSEY.

CDEPRESSOR.

Apulication tiled February 7, 1922. Seria! No. 534,683.

T0 all whom t 'may concern Be it known that l, WILLIAM Prinunwrrz,-

In my co-pending application, Serial No. 386,278 filed June 3, 1820, l have disclosed a compressor especially designed for pumping up tires and having provlsion for preventing lubricating material from commingling with the air compressed, so that oil is kept out ofthe tires, and I prefer to show. this same feature in connection with my present invention and also provide the compressor with means for conveniently mounting it on the gear box of a motor ruck.

The objects of the present invention are to enable the machine to be easily assembled Y and taken apart and-furthermore to prevent oil or liquid grease in the gear 'casing of the machine from entering the crank case of the compressor. Such lubricating material mightpass along the crank shaft into the compressor crank case, but my construction enmectually prevents such action in a, simple and efficient manner.

Further objects of the invention will here in'after appear` and to all of these ends the invention consist-s of the features of Iconstruction, arrangement of parts and combinations ot' elements hereinafter described and claimed in this specification and shown in the accompanying drawings, in Which- Figure i is a top plan view of the machine,

Figure 2 is a longitudinal sectional` elevation of the machine on the line 2 2 of Fig# ure 1,' looking,r in the direction of the arrows,

Figure ,3, iS an end elevation of the inachine partly in transverse section on the line 3-3 of Figure l, looking in the direction of the arrovvs, the machine being shown connected to the gear box of a truck, and

Figi'rure 4 is a detail perspective View of the locking spring pin and forked gear.,

shifter for the machine.

Referring: to the drawings, the cylinder A and crank case B may be formed in any suitable manner, and in this instance the upperportion C of the crank case forms the usual breathing Space for the crank, communicating with the atmosphere at the openings D preferably covered by the screen plates D.

The piston reciprocating-in the cylinder A. is preferably provided with the outer or upper head E and the inner or lower head F connected by the reduced neck G. The

'piston is connected to the crank H `by the connecting rod l and the piston and cylinu der are supplied with oil from the crank case B, the oil being indicated at K2 The cylinder is provided with a suitable head L having` the inlet opening() preferably covered by the screen O', and also having the outlety P. Between the head L and the cylinder A is preferably placed a plate Q carrying the inlet valve R and the discharge valve S. These valves are pref- 'erably in the form of strips of sheet metal,

as shown in my copending application, `and suitably secured to the plate Q by means of the screws and nuts T and U. The valves are adapted to seat over the inlet port and driven from the motor vehicle engine, asA

will be described.

Drainage apertures a are shown in my said copending application, are provided in the The head L cylinder Walls, and in order-.to collect and drain away the excess oil, a circular groove is formed inside the cylinder A; communicating with the apertures a. The groove b is located at a point intermediate the upper and lower limits of the overlap of the outer and inner pistons'E and F in their travel. Another cooperating groove c is formed in the periphery of the inner piston head F to collect the excess oil and carry it into the collecting groove 7J and permit the oil to drain out of the apertures a, all preferablyv as disclosed in my said c'o-pending application. v

in order to adapt the compressor for mounting on-the gear box of a lmotor truck, l connect a gear casing Y at one side of the crank case B of the compressor and provide the gear casing with a iiange Z, Which may be connected tothe gear box d of a motor truck, asv by means of the bolts e. The gearfv in the motor truck gear box d then meshes with the idler gear g carried by the gear case.

Y-of the compressor, which may be shifted into and out of mesh with the gear 7i,

is provided with a fork p engaging a grooved sleeve g forming part of the hub of the idler arg-and sliding on the idlergear shaft r. ie locking plate s carried by the coupling member t on the shifting rod o cooperates with a locking spring pin u mounted on the gear, casing for maintaining the gear shifter and idler gear g in the desired position. In order to enable the parts of the machine to be readily and conveniently assembled and disassembled, a removable bearing plate u having extensions on each side thereof is provided between the gear casing Y and the crank case B, and these three parts of the frame are suitably held together by means of the screws W. This bearing plate v fits into and closes the opening o in the side of the crank case B and also fits into and closes asimilar opposite opening lv2 in the adjacent side of the gear casingY, so that the parts are held securely and rigidly in alignment. The bearing plate o forms a main bearing for the'crank shaft X upon which the driving gear 71, is mounted, a d a main bearing bushing vis preferably Eyrovided for the crank shaft. An nut-board bearing bushing g/ is also provided in the gear casing Y for the outer end of the crank shaft X.

The ring z of the connecting rod J is adapted to be slipped over the crank pin 2 of the crank H and bears against the inner finished face 3 of the crank case, -so that the connecting rod is prevented from coming off the crank pin. The opposite end of the connecting rod is connected tothe piston by means ot the usual piston pin 4. Lubricating material l( is supplied to the cran-k case through the oil cup 5 and an oil splash pin 6 is provided on the connecting rod. The

memes passing into the crank case B of the compresser along the crank shaft. ln order to prevent such passage of oil, 'sealing means.,

preferably in the form of a cup leather 8 and gland 9 are inserted in one of the bearing plate extensions around the crank shaft X in the gear casing Y and the cup leather is preferably surrounded by a springe-'10,

.which presses and locks the cup leather against the shaft and eiectually revents the oil from passing along theshait to the compressor crank case. The parking 8 as shown is preferably seated against an interlnal shoulder 1l in the bea-ringp'late exten- Any suitable means may be provided .for shifting the `idler gear g, and in this instance, a rod jmanipulated by a handle f,"

tion, which extends into the gear case, and the main bearing bushing extends partially through the bearing plate to a oint adjacent the said packing seat. This orins `a satisfactory and tight seal around the is also readily accessible.

crank shaft, Which l claim: v 1. A compressor having in combination a crank case, a gear case adapted to contain lubricant, a main bearing between'the said two cases having an internal shoulderlocated within the 'gear case, a crank shaft in sald main bearing andI also 'havlng a bearing in the outerend of the gear case, a main bushing for the crankv shaft extending through t-he said main bearing to a point adjacent the said internal shoulder, a flexible packing around the cra-nk' shaft seated on said internal shoulder, and ay gland for holding the packing in position, whereby lubricant is prevented from passing along" the shaft from the gear case to the crank case. 2: A compressor havingin combination a crank case, a gear case adapted to contain lubricant, a removable .bearing plate fitting into and closing opposite openings in the ,adjacentsides of both. the' crank case and gearcase, said bearingplate having extensions at each side, the extension on the gear case side having an internal shoulder torming a packing seat, a crank shaft having a bearing in said bearing plat-e and also in the outer end of the gear case, a main bushing for said crank shaft extending partially through the bearing plate, a flexible packing around the crank shaft seated on said internal shoulder and a gland for holding the packing in position. whereby lubricant is prevented from passingA along the shaft from the gear case to the crank case.

In testimony whereof l have signed this specification.

WLLrAM rnnnmvrrz. 

